1. Turn your Sony VGN-SZ340P laptop over.
2. Find the laptop battery release button lock for your Sony VGN-SZ340P laptop.
3. Now that your Sony VGN-SZ340P laptop battery is unlocked, find the battery release button down.
4. Holding the laptop battery release button, gently pull your battery away from the laptop.
5. Now that your Sony VGN-SZ340P battery is removed, grab your replacement Sony VGN-SZ340P battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-SZ340P battery towards the laptop and secure it in place.